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# == Participable concern
#
# Contains functionality related to objects that can have participants, such as
# an author, an assignee and people mentioned in its description or comments.
#
# Used by Issue, Note, MergeRequest, Snippet and Commit.
#
# Usage:
#
# class Issue < ActiveRecord::Base
# include Participable
#
# # ...
#
# participant :author, :assignee, :mentioned_users, :notes
# end
#
# issue = Issue.last
# users = issue.participants
# # `users` will contain the issue's author, its assignee,
# # all users returned by its #mentioned_users method,
# # as well as all participants to all of the issue's notes,
# # since Note implements Participable as well.
#
module Participable
extend ActiveSupport::Concern
module ClassMethods
def participant(*attrs)
participant_attrs.concat(attrs.map(&:to_s))
end
def participant_attrs
@participant_attrs ||= []
end
end
def participants(current_user = self.author)
self.class.participant_attrs.flat_map do |attr|
meth = method(attr)
value =
if meth.arity == 1 || meth.arity == -1
meth.call(current_user)
else
meth.call
end
participants_for(value, current_user)
end.compact.uniq
end
private
def participants_for(value, current_user = nil)
case value
when User
[value]
when Enumerable, ActiveRecord::Relation
value.flat_map { |v| participants_for(v, current_user) }
when Participable
value.participants(current_user)
end
end
end
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